CN101725146A - Static sunken pile construction technique for alternatively, sectionally and gradually spirally leading hole and statically sinking pile in pipe - Google Patents
Static sunken pile construction technique for alternatively, sectionally and gradually spirally leading hole and statically sinking pile in pipe Download PDFInfo
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- CN101725146A CN101725146A CN200910186602A CN200910186602A CN101725146A CN 101725146 A CN101725146 A CN 101725146A CN 200910186602 A CN200910186602 A CN 200910186602A CN 200910186602 A CN200910186602 A CN 200910186602A CN 101725146 A CN101725146 A CN 101725146A
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Abstract
The invention relates to an automatically leading hole and statically sinking pile method for alternatively, sectionally and gradually spirally leading hole and statically sinking pile in pipe, and further relates to a PHC pipe pile static pile sinking device. The automatically leading hole and statically sinking pile method for alternatively, sectionally and gradually spirally leading hole and statically sinking pile in pipe comprises: leading hole to a foundation 7 by a drilling rod 6 in a hollow hole 3 in the PHC pipe pile 2 when the PHC pipe pile 2 cannot be sunken at the maximum pressure by a static pile pressing machine 1; then statically sinking the PHC pipe pile 2; and repeatedly and alternatively operating until the PHC pipe pile 2 is sunken to part with level as designed. Making use of the method, the obvious problem that the geology hard layer cannot be penetrated in the way of static pressing PHC pipe pile can be solved, specifically the difficult problem that thick and deep grit layer cannot be penetrated; other subordinate contamination can be prevented in construction process of the method; excellent construction condition can be kept; the hole will not fall off when leading hole, and the leading hole failure phenomenon can be prevented.
Description
Technical field
The present invention relates to a kind ofly auger stem is inserted in the PHC pile tube inwall cavity segmentation draw the hole, simultaneously progressive PHC pipe pile static-pressure piling construction technology with the static pressure pile-sinking alternatively, sectionally, what the invention still further relates to a kind of PHC pipe pile static-pressure pile sinking draws hole equipment.
Background technology
Advantages such as industry is used pile foundation in a large number with the development of civilian construction, and the PHC pile tube is a suitability for industrialized production, is easy to guarantee with quality, and speed of application is fast, and cost is low and become the main selection and the developing direction of stake for building, the whole world is all general a large amount of the use.At present, the construction pile-sinking method of PHC pile tube mainly contains hammering and static pressure two class process for sinking.Paddle type mill pile sinking penetration power is strong, but has vibration, severe contaminations such as noise, discontented toe ring guaranteed request; Static pressure pile-sinking can satisfy environmental requirement, it is a kind of job practices that is widely used in the environmental protection of incity, city, but penetration power is weaker than hammering method, be applicable in the soft foundation, to there being the ground of closely knit hard formation, particularly thick dark sandy gravel stratum in the stratum, because of penetrating resistance big, the stake end is difficult to penetrate this layer, can't make the stake end enter the bearing stratum of designing requirement.
How to overcome static pressure PHC pile tube and penetrate closely knit hard formations such as thick dark sandy gravel stratum, making static pressure PHC pile tube stake end can enter the bearing stratum of designing requirement smoothly, is to continue to apply that this work efficiency height of static pressure PHC pile tube, noiselessness, friction, pile sinking are stable, the technical barrier that job practices faced of compliance with environmental protection requirements.
The domestic job practices that makes static pressure PHC pile tube stake end penetrate closely knit hard formations such as thick dark sandy gravel stratum mainly is to draw the hole in hard formation at present, the method of drawing the hole mainly contains two big classes: a class is a water jetting: in the process of static pressure, in PHC pile tube inwall cavity, place water pipe and tracheae by auxiliary equipment, wash away the hardpans such as gravelly sand of stake end with aqueous vapor, reach the effect that reduces end resistance, make static pressed pile stake end penetrate this layer; Another kind of is to creep into drawing bore method: before construction of Static Pressure Pile, on the piling position, ground, bored emptying aperture with the mode of drilling equipment earlier from the face of land to set depth, pan soil is taken out, and telephone-moving is in place to this position again for Static pressure pile driver then, puts into the PHC pile tube and carries out the static pressure construction.First kind water easily produces the pile perimeter resistance loss towards drawing bore method, reduce the bearing capacity of pile of PHC pile tube, cause a large amount of ponding in construction plant simultaneously, construction costs height, long in time limit, another kind of creep into drawing bore method since the secondary of phreatic effect and Static pressure pile driver with regard to the influence of displacement machine, very easily produce collapse hole or inclined hole, cause draw hole inefficacy or pile body inclining and cause static pressed pile still can't penetrate closely knit hard formation or cause constructing invalid.How overcoming above static pressed pile and draw the construction difficult problem that the hole penetrates closely knit hard formation, is the present domestic technical barrier that faces.
Summary of the invention
The purpose of this invention is to provide a kind of pipe inside spin and draw hole and the progressive static pressure pile-sinking construction technology of static pressure pile-sinking alternatively, sectionally.What purpose of the present invention also provided a kind of PHC pipe pile static-pressure pile sinking draws hole equipment.
The pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, when static pressure pile-sinking to depth at need, employing place in the cavity in the PHC pile tube draw hole drill carry out to ground draw the hole after, after will drawing upwards that hole drill is counter and pulling out, carry out static pressure pile-sinking again; Hocket repeatedly and draw the hole, counter pulling out, static pressure pile-sinking; Sink to design elevation until the PHC pile tube.
The pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, its operating procedure is: will draw hole drill and import in advance in the PHC pile tube cavity before static pressure pile-sinking; Begin static pressure pile-sinking again; When static pressure pile-sinking to depth at need, open draw hole stake mechanomotive force device drive in the cavity that places in the PHC pile tube draw hole drill carry out to ground draw the hole after, after will drawing upwards that hole drill is counter and pulling out, carry out static pressure pile-sinking again; Hocket repeatedly and draw the hole, counter pulling out, static pressure pile-sinking; Sink to design elevation until the PHC pile tube.
With the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, wherein: by static pile press, frame, power set, draw hole drill, oil cylinder capping beam and extensible member and form; Be provided with frame on the platform of static pile press, the top of frame is provided with power set and oil cylinder capping beam, and power set drive and draw hole drill, and an end and the oil cylinder capping beam of extensible member fix, and the other end and the power set of extensible member fix.
The present invention has successfully solved the technical barrier that static pressed pile penetrates closely knit hard formation, the technical matters that solves provides a kind of by in the downward static pressure pile-sinking process of PHC pile tube, to draw hole drill inserts earlier in the PHC pile tube inwall cavity and also can insert behind the static pressure pile-sinking certain depth again, reach more greatly or during at static pressure to penetrating resistance down near the pile body ultimate bearing capacity, the hole is drawn in the beginning segmentation, draw the Kong Houzai static pressure pile-sinking, static pressure pile-sinking with draw the construction technology that the hole alternatively, sectionally carries out, can't be more down during pile sinking at static pressure pile-sinking, continuously in follow-up pile driving process, the hole is drawn in segmentation and the segmentation static pressure hockets, press while drawing, make the PHC pile tube penetrate closely knit hard formation smoothly.
Operating principle of the present invention: on Static pressure pile driver, set up short spiral and draw hole equipment and can add grouting equipment, elder generation's Static pressure pile driver piling pile sinking in place, when running into as hard formations such as gravels, the stake resistance is bigger, in the time of can't continuing pile sinking again, the corresponding 0.5-8m of being adjusted to of mechanics index of physics that use places the short auger stem of PHC pile tube inwall cavity to creep into downwards to draw hole to the following 2-4 rice degree of depth drilling depth of stake end to look hardpan all can upwards mention in the inwall cavity of short screw rod to the PHC pile tube stake end and gets final product, under the stake end, form the emptying aperture of certain depth, continue downward static pressure pile-sinking again, the following hardpan of this moment stake end under the static pressure of PHC pile tube under the stake end emptying aperture of certain depth cave in, reduced end resistance, make stake continue downward pile sinking, when end resistance increases again and can't continue pile sinking the time gradually again, repeating above-mentioned short screw rod draws hole drill and advances, continue downward static pressure pile-sinking again, so repeatedly, make the stake end penetrate hardpan smoothly, reach the design bearing stratum, the short distance of whole process draws the hole and static pressure pile-sinking is that segmentation is alternately carried out synchronously, and two kinds of construction equipments fuse not separated, the pan soil that also will not draw the hole simultaneously takes out ground, and two construction sequences hocket.Penetrate closely knit hardpan until PHC pile tube stake end, reach the design bearing stratum.If when continuing downward static pressure, find the hole of collapsing under the stake end, draw additional grouting equipment on the equipment of hole and can inject adhesive pulping materials such as slime water mud or bentonite in the drilling rod cavity and be split into mud off and avoid the hole of collapsing in the counter again back of pulling out of boring.
The invention has the beneficial effects as follows: compared with prior art, the invention has the advantages that: the first, set up the equipment that can draw the hole on the Static pressure pile driver platform, realized effective combination of two kinds of distinct devices, same machine operation is controlled easy; The second, because at the pipe inner hole, the sand of being drawn can be emitted on automatically in the PHC pile tube emptying aperture and store, do not produce other attached pollutant, it is good that construction environment keeps; Three, owing to draw the hole in the soil body under PHC pile tube end, can effectively check in the bottom portion soil layer whether have obstruction, get rid of, run into underground obstacle when avoiding piling and cause broken pile so that take appropriate measures; Four, because at PHC pile tube emptying aperture inner hole, it draws bore dia less than PHC pile tube diameter, frictional resistance can not lose around the PHC pile tube, does not influence the performance of soil bearing capacity; Five, since when drawing the hole Static pressure pile driver need not move and, limited by the position of PHC pile tube inwall at PHC pile tube emptying aperture inner hole, can not exert an influence when drawing the hole to the pile body verticality, do not cause pile body inclining; Six, because the present invention is to adopting the hole drill segmentation of drawing that imports in advance in PHC pile tube emptying aperture to draw the hole during depth in the Static pressure pile driver construction, continue static pressure pile-sinking again, the hole is drawn in segmentation and the segmentation static pressure pile-sinking hockets, therefore its construction continuously, draw the hole and static pressure pile-sinking is once finished, do not exist ground to the full degree of depth of set depth draw behind the hole Static pressure pile driver again telephone-moving back in place stake produce and collapse the hole and cause and draw the hole failure phenomenon; Seven, can make the PHC pile tube under the static pressure effect, penetrate thick dark sandy gravel stratum, reach the ideal designs degree of depth; Eight, it has overcome the difficult problem that common static pressure type PHC tube pile construction technology penetrates the geology hard formation, has that the sandy gravel stratum of penetrating is effective, efficiency of construction is high, construction cost is low.
Description of drawings
Fig. 1 PHC pipe pile static-pressure of the present invention pile sinking device structure schematic diagram;
The local enlarged diagram of Fig. 2 PHC pipe pile static-pressure of the present invention pile sinking equipment;
Fig. 3 PHC pipe pile static-pressure of the present invention pile sinking equipment side schematic view;
Reference numeral:
Specific embodiment
Static pressure pile-sinking is meant: static pile press 1 is held the process of PHC pile tube 2 downward pilings tightly.
To draw hole drill 6 before static pressure pile-sinking imports in PHC pile tube 2 cavitys 3 in advance; Begin static pressure pile-sinking again; When static pressure pile-sinking to depth at need, open draw hole stake mechanomotive force device 5 drive in the cavity 3 that places in the PHC pile tube 2 draw hole drill 6 carry out to ground draw the hole after, upwards will draw hole drill 6 counter pulling out after, carry out static pressure pile-sinking again; Hocket repeatedly and draw the hole, counter pulling out, static pressure pile-sinking; Sink to design elevation until PHC pile tube 2.
Embodiment 4, pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, wherein: the degree of depth of at every turn drawing the hole is a 0.5-13 rice.All the other are with any one among the embodiment 1-3.
The degree of depth of at every turn drawing the hole is exactly to draw the degree of depth that hole drill 6 creeps into downwards in each unit at every turn.
| The downward drilling depth in each unit (m) | At inviscid chiltern soil layer effect | At toughness chiltern soil layer effect | At non-grittiness hard layer |
| ??0.1-0.3 | Not obvious | Not obvious | Not obvious |
| ??0.5-1.0 | Generally | Generally | Generally |
| ??1.0-3.0 | Best | Preferable | Best |
| ??3.0-5.0 | Preferable | Best | Preferable |
| The downward drilling depth in each unit (m) | At inviscid chiltern soil layer effect | At toughness chiltern soil layer effect | At non-grittiness hard layer |
| ??5.0-7.0 | Generally | Generally | Generally |
| ??7.0-9.0 | Difference, the easy hole of collapsing | Difference, waste drilling time and power | Difference, waste drilling time and power |
Embodiment 7, pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, wherein: anti-length of pulling out is drawn the 100%-120% rice of the degree of depth in hole for this unit at every turn.All the other are with embodiment 6.
Each anti-length of pulling out is meant: this unit draws after the hole stops, from draw the hole stop to this time counter pull out between stopping to locate apart from length.
| Each unit drilling rod back suction height (m) | Effect | Defective |
| ??0.5-1.0 | All can | Increase the back suction number of times |
| ??1.0-2.0 | All can | But do not reach optimum efficiency, |
| ??2.0-3.0 | All can | Satisfactory for result |
| ??3.0-4.0 | All can | Back suction height height, and increase the idle time of back suction |
| ??4.0-6.0 | All can | Back suction height height, and increase the idle time of back suction |
| ??7.0 | All can | Waste power is obvious |
| Spire bit length (m) | Effect | Defective |
| ??0.1-0.3 | Construction times is more repeatedly | Inefficiency |
Embodiment 8, with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, wherein: by static pile press 1, frame 4, power set 5, draw hole drill 6, oil cylinder capping beam 7 and extensible member 8 and form; Be provided with frame 4 on the platform of static pile press 1, the top of frame 4 is provided with power set 5 and oil cylinder capping beam 7, and power set 5 drive and draw hole drill 6, and an end and the oil cylinder capping beam 7 of extensible member 8 fix, and the other end of extensible member 8 and power set 5 fix.
Embodiment 9, with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, wherein: an end of moving member 12 is fixed on the static pile press 1, the other end of moving member 12 and frame 4 active links.
Embodiment 11, with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, wherein: draw hole drill 6 and form by drilling rod and spiral head.All the other are with any one among the embodiment 8-11.
Spire bit length and effect analysis:
| ??0.5-1.0 | Better, can reach construction effect | Increase and creep into and the back suction number of times, and it is less to fetch earth, and influences speed of application |
| ??1.0-3.0 | Better, reached construction effect | But do not reach optimum efficiency, creep into the back suction number of times still morely, influence speed of application |
| ??3.0-5.0 | The effect that proposes soil is better | Blade with soil still insufficient |
| ??5.0-7.0 | The effect that proposes soil is better | Best |
| ??7.0-9.0 | The effect that proposes soil is better | Make deformable blade increase power simultaneously easily |
| ??9.0-11.0 | The effect that proposes soil is better | Make deformable blade increase power, inconvenient operation simultaneously easily |
| ??11.0-13.0 | The effect that proposes soil is better | Make deformable blade increase power, inconvenient operation simultaneously easily |
| ??13.1-18.0 | The effect that proposes soil is better | Inconvenient operation, the extracting difficulty |
Embodiment 12, with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, wherein: the described hole drill 6 that draws can stretch.All the other are with any one among the embodiment 8-11.
Embodiment 13, with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, comprise static pile press 1, PHC pile tube 2, static pile press 1 is held PHC pile tube 2 tightly, wherein: assigned in the cavity 3 of PHC pile tube 2 and drawn hole drill 6.All the other are with any one among the embodiment 8-11.
Explain operating principle of the present invention in conjunction with the embodiments:
When Static pressure pile driver 1 usefulness maximum pressure also can't make PHC pile tube 2 sink, draw 6 pairs of underground soil layers of hole drill or sandy gravel stratum etc. by device 5 drives that turn on the power and draw the hole operation, hold pan soil to lead to PHC pile tube inwall cavity 3 stake, reduce the effect that end resistance reaches static pressure pile-sinking, counter-rotating pulls up and draws hole drill 6 and carry out static pressure pile-sinking after drawing the hole certain depth, when static pressure pile-sinking once more downwards during depth, draw the hole again, carry out repeatedly, till static pressure pile-sinking to the bearing stratum of designing requirement and pile driving pressure meets the demands, after stopping drawing the hole, also can append repeatedly and exert pressure, till pile driving pressure was stable, whole again hole was so that better guarantee pile quality.
Claims (13)
- The pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, it is characterized in that: when static pressure pile-sinking to depth at need, employing place in the cavity (3) in the PHC pile tube (2) draw hole drill (6) carry out to ground draw the hole after, after upwards will drawing counter the pulling out of hole drill (6), carry out static pressure pile-sinking again; Hocket repeatedly and draw the hole, counter pulling out, static pressure pile-sinking; Sink to design elevation until PHC pile tube (2).
- The pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, it is characterized in that: its operating procedure is:To draw hole drill (6) before static pressure pile-sinking imports in PHC pile tube (2) cavity (3) in advance; Begin static pressure pile-sinking again; When static pressure pile-sinking to depth at need, open draw hole stake mechanomotive force device (5) drive in the cavity (3) that places in the PHC pile tube (2) draw hole drill (6) carry out to ground draw the hole after, upwards will draw counter the pulling out of hole drill (6) after, carry out static pressure pile-sinking again; Hocket repeatedly and draw the hole, counter pulling out, static pressure pile-sinking; Sink to design elevation until PHC pile tube (2).
- 3. pipe inside spin as claimed in claim 1 draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, it is characterized in that: before static pressure pile-sinking, will draw hole drill (6) and import in advance in PHC pile tube (2) cavity (3); Begin static pressure pile-sinking again.
- As described any one pipe inside spin of claim 1-3 draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, it is characterized in that: the degree of depth of at every turn drawing the hole is a 0.5-13 rice.
- 5. pipe inside spin as claimed in claim 4 draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, it is characterized in that: the degree of depth of at every turn drawing the hole is a 2-4 rice.
- As described any one pipe inside spin of claim 1-3 draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, it is characterized in that: anti-length of pulling out is drawn the 90%-200% of the degree of depth in hole for this unit at every turn.
- 7. pipe inside spin as claimed in claim 6 draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the hole pile jacking in method certainly, it is characterized in that: each anti-length of pulling out is drawn the 100%-120% of the degree of depth in hole for this unit.
- With the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, it is characterized in that: by static pile press (1), frame (4), power set (5), draw hole drill (6), oil cylinder capping beam (7) and extensible member (8) and form; On the platform of static pile press (1), be provided with frame (4), the top of frame (4) is provided with power set (5) and oil cylinder capping beam (7), power set (5) drive and draw hole drill (6), one end of extensible member (8) and oil cylinder capping beam (7) fix, and the other end of extensible member (8) and power set (5) fix.
- 9. as claimed in claim 8 and pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, it is characterized in that: an end of moving member is fixed on the static pile press (1), the other end of moving member and frame (4) active link.
- As claimed in claim 8 or 9 with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, it is characterized in that: cement injection machine (10) is communicated with by Grouting Pipe (11) cavity (3) inner with drawing hole drill (6), and the bottom of drawing hole drill (6) is provided with cement paste delivery port (9).
- 11. as claim 8-11 described with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, it is characterized in that: draw hole drill (6) and form by drilling rod and spiral head.
- 12. as claim 8-11 described with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, it is characterized in that: the described hole drill (6) that draws can stretch.
- 13. as claim 8-11 described with the pipe inside spin draw hole and static pressure pile-sinking alternatively, sectionally progressive draw the matching used equipment of hole pile jacking in method certainly, comprise static pile press (1), PHC pile tube (2), static pile press (1) is held PHC pile tube (2) tightly, it is characterized in that: assigned in the cavity (3) of PHC pile tube (2) and drawn hole drill (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910186602A CN101725146A (en) | 2009-12-02 | 2009-12-02 | Static sunken pile construction technique for alternatively, sectionally and gradually spirally leading hole and statically sinking pile in pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910186602A CN101725146A (en) | 2009-12-02 | 2009-12-02 | Static sunken pile construction technique for alternatively, sectionally and gradually spirally leading hole and statically sinking pile in pipe |
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| CN101725146A true CN101725146A (en) | 2010-06-09 |
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| CN102011403B (en) * | 2010-09-10 | 2012-03-21 | 李新桥 | Down hole impact type hydraulic static pile driving machine |
| CN102400465A (en) * | 2010-09-10 | 2012-04-04 | 湖北毅力机械有限公司 | Static pressure moderately-excavated pile pressing machine and static pressure moderately-excavated pile pressing construction method |
| CN102011403A (en) * | 2010-09-10 | 2011-04-13 | 李新桥 | Down hole impact type hydraulic static pile driving machine |
| CN102493452A (en) * | 2011-11-30 | 2012-06-13 | 蔡嘉明 | Grouting pile-grafting construction method and equipment |
| CN103628480A (en) * | 2012-08-27 | 2014-03-12 | 上海中技桩业股份有限公司 | Construction method and device for guide displacement pressure precast pile |
| CN105239574B (en) * | 2014-06-17 | 2017-08-29 | 中建二局第一建筑工程有限公司 | Construction method applied to the static-pressure prestressed drilled pile for filling out Haiti matter |
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| CN105926618A (en) * | 2016-04-15 | 2016-09-07 | 王继忠 | Construction method for prefabricated piles |
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| CN110952548A (en) * | 2019-12-17 | 2020-04-03 | 广东力源液压机械有限公司 | Drill rod drilling guiding method for large-diameter PHC pipe pile leading hole and drill rod thereof |
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| CN112030968A (en) * | 2020-08-28 | 2020-12-04 | 江苏原土建筑设计有限公司 | Novel construction process for solving holding pressure pile sinking difficulty |
| CN112324322A (en) * | 2020-09-17 | 2021-02-05 | 广州市市政工程试验检测有限公司 | Rock-soil drilling device, follow-drilling pipe pile and rock-soil drilling method |
| CN112681310A (en) * | 2020-12-28 | 2021-04-20 | 中交二公局第一工程有限公司 | Construction method for inserting and driving Larsen steel sheet pile after hole leading by long spiral drilling machine |
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Open date: 20100609 |